What does PPB mean in NASA?

This page is about the meanings of the acronym/abbreviation/shorthand PPB in the Governmental field in general and in the NASA terminology in particular.

Parts per Billion (p/b preferred)

Governmental » NASA


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"PPB." Abbreviations.com. STANDS4 LLC, 2015. Web. 29 Jul 2015. <http://www.abbreviations.com/term/566054>.